Bit or cutting tool



May 25. 1926. "1,586,151

- L. F. HESS BIT 0R CUTTING TOOL Filed May 8 1922 Patented May 25, 1926.

UNITED STATES PATENT OFFICE.

LOUIS F. HESS, OF ANSTED, WEST VIRGINIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, T DANIEL BOONE MINING MACHINE COMPANY, A CORPORATION 01 WEST VIRGINIA.

BIT OR CUTTING TOOL.

Application filed May 8, 1922.

This invention aims to provide novel means whereby cutting bits may be held securely but removably on the boring bar of a mining machine or like device.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains.

With the above and other objects in View, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that, with in the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departing from the spirit of the invention.

In the accompanying drawings Figure 1 shows in side elevation, a device constructed in accordance with the invention; Figure 2 is a transverse section; Figure 3 is a fragmental longitudinal section; Figure 4 is a perspective view delineating one of the bits.

The numeral 1 marks, generally a boring bar or auger, of the sort shown 111 my prior Patents Nos. 1,147,724 and 1,200,941, the

auger comprising a body 2 provided with an outstanding spiral rib 3. Slits orseats 4, are formed in the rib 3 and are spaced apart circuinierentially, the seats being so located that the rib will not be weakened. Each seat 4 has a concaved base 5. A securing element 6 such as a rivet, extends through the rib 8 across the seat 4, the ends of the securing element being butt-ended on the opposite surfaces of the rib 3, if desired.

Bits 7 are provided, each bit being in the form of a plate having a concaved edge 8 and provided with a convexed edge 9, the edge 9 cooperating with the concaved edge 8 to form a cutting point 10. The edges 9 and 8 of the bit are connected by a convexed cam edge 14. A notch 12 is formed in the concaved edge 8 of the bit 7 and de fines a reduced end 14 in the bit.

The bit 7 is of such a width as to fit closely in the seat 4. The end 14 of the bit ex- Serial No. 559,302.

tends beneath the securing element 6, the securing element being received in the notch 14'of the bit, and the cam edge 11 of the bit cooperating with the concaved base of the seat 4. The auger is rotated always in a clockwise direction as indicated by the arrow A in Figure 4, and the more strain that is put on the bit 7, the more firmly will the bit be held in the seat 4, owing to the cooperation between the cam edge 11 of the bit and the concaved base 5 of the seat 4. Then it is desired to remove the bit 7 a hammer blow on the bit, adjacent to its polnt and in the direction of the arrow B, will efiect a loosening of the bit so that the bit may be removed readily from the seat 4.

What is claimed is:-

An auger of the class described, provided with a seat of common width throughout its entire extent, the seat having a base which is continuously concaved from one end of the seat to the other, a securing element mounted in the auger and extended across the seat, and a bit of common width throughout its entire extent, the bit being mounted in the seat and having a notch re ceiving the securing element, the bit being engageable with the securing element by rotary movement about the axis of the securing element when the securing element is received in the notch, the bit having a cam edge cooperating with the base of the seat, the space within the seat and in front of the bit being open, so that the bit can be swung far enough in one direction, on the securing element, to stop the movement of the bit in said direction solely by the engagement between the cam edge of the bit and the concaved base of the seat, the bit terminating in a cutting point located outwardly of the auger and extended beyond a radius passing through the center of the auger and the center of the securing element.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature.

LOUIS F. HESS. 

